probe-scsi-all WWN Mapping Overview

The output displayed by probe-scsi-all lists all SCSI devices in the server and
provides a basic set of information about each device. When analyzing the probe-scsi-all
output, look for the following data fields:

Entity Name

Definition

Target

Each SAS or SATA drive is
assigned a unique Target ID.

SASDeviceName

This is the WWN value assigned to a SAS
drive by the manufacturer. The Oracle Solaris OS recognizes this name.

SASAddress

This is the
WWN value assigned to a SCSI device that is recognized by the OBP
firmware.

PhyNum

This is a hexidecimal ID of the controller port that is attached to
the target drive.

VolumeDeviceName (when a RAID volume is configured)

This is the WWN value
assigned to a RAID volume that is recognized by Oracle Solaris OS. The
VolumeDeviceName replaces the SASDeviceName of every SCSI device contained in the RAID volume.

Use the
VolumeDeviceName entitiy to determine the correct target in a RAID volume, or when
the server is configured with an optional internal RAID HBA controller.

VolumeWWID (when a
RAID volume is configured)

This is the WWN-based value assigned to a RAID volume
that is recognized by the OBP firmware. VolumeWWID replaces the SASAddress of every
SCSI device contained in the RAID volume.

At a high level, the WWN mapping process consists of the following stages:

Identify the physical location of the hard drive that is to be the target of the operation.

Then identify the controller port that is attached to that physical location.

Finally, find the WWN-based device name of the drive attached to that controller port.

Examples of this process are provided for each of the SPARC T4 server
models: